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Diesel rings work very well but yet they are too tight if you ever tried to take the top off of the jet water pipe it is not easy they should be reengineered to put on and take off more easily
Thanks for the review! The mouthpiece has two different-sized grooves, so if it's too tight try putting the o-ring in the other groove. Also, applying vaseline or chapstick to the o-ring will make the removal much easier.